Forged Spur Gears
Table of Contents
Custom Spur Gears Manufacturer | Forged & CNC Machined
Weforging manufactures custom spur gears to OEM drawings and application requirements, combining hot forging, CNC machining, gear cutting, heat treatment, and inspection in one controlled production chain.
From forged gear blanks to finished machined gears, we support industrial OEMs with material traceability, controlled batch quality, and repeat production for gearboxes, mining equipment, construction machinery, and heavy-duty power transmission systems.
Custom Spur Gears Manufactured to Your Drawings
Weforging manufactures custom spur gears according to customer drawings, samples, and application requirements. Gear parameters such as module or diametral pitch, pressure angle, tooth count, bore, keyway, spline, material, heat treatment, hardness, and inspection requirements can be specified for each project.
For OEM production, our engineering team reviews the drawing and manufacturing requirements before production to confirm the appropriate forging, machining, gear cutting, heat treatment, and inspection route.
Custom Spur Gear Specifications
| Item | Specification |
|---|---|
| Gear Type | Spur Gear, External Spur Gear |
| Manufacturing Process | Hot Forging, CNC Machining, Gear Cutting |
| Material Options | 20CrMnTi, 16MnCr5, 20MnCr5, 42CrMo, 4140, 40Cr |
| Module | M1 – M16 |
| Number of Teeth | 8 – 200 teeth |
| Outer Diameter | 30 – 500 mm |
| Bore Type | Smooth Bore, Keyway Bore, Spline Bore |
| Heat Treatment | Carburizing, Induction Hardening, Quenching & Tempering, Nitriding |
| Tooth Hardness | HRC58–62 (Carburized), HRC45–55 (Induction Hardened) |
| Surface Finish | Ra ≤0.8 μm on machined surfaces |
| Tolerance | IT6 – IT8 depending on requirements |
| Inspection | CMM Measurement, Gear Inspection, Hardness Testing, UT/MT |
| Standards | DIN, ISO, ANSI, Customer Drawings |
Materials and Heat Treatment for Custom Spur Gears
Different applications require different combinations of strength, wear resistance, and toughness. We select suitable alloy steel materials and heat treatment processes according to operating conditions and customer requirements.
Common material options include:
- 20CrMnTi / 16MnCr5 – suitable for carburized gears requiring high surface hardness and wear resistance.
- 42CrMo / 4140 – high-strength alloy steels for heavy load and impact applications.
- 40Cr – commonly used for medium-load industrial transmission systems.
Available heat treatment processes include carburizing, induction hardening, quenching and tempering, and nitriding to achieve the required hardness and service performance.
When Should You Choose a Forged Spur Gear?
Forged gear blanks are typically considered for heavy-duty applications where torque, cyclic loading, shock loading, fatigue resistance, or material integrity are important design factors.
Compared with producing a large gear entirely from bar stock, near-net or profiled forged blanks can also reduce material waste and subsequent machining for suitable geometries. The final manufacturing route should be selected according to gear size, loading conditions, material, quantity, and drawing requirements.
Spur Gear Manufacturing Process
Each custom spur gear undergoes a controlled, multi-stage manufacturing process to ensure consistent mechanical performance and dimensional accuracy.
1. Hot Forging
The forging process produces a dense, uniform grain flow structure that significantly improves strength, fatigue resistance, and impact toughness compared with cast gears.
The gear blank is precisely machined to ensure proper concentricity, bore tolerance, and hub geometry—critical factors for stable gear meshing.
3. Gear Cutting / Hobbing / Shaping
Involute tooth profiles are formed using gear hobbing, shaping, or milling. Optional gear grinding is available for high-precision or low-noise applications.
Depending on the application, gears may be treated by carburizing & quenching, induction hardening, or through-hardening to achieve a hard wear-resistant surface and a tough inner core.
5. Final Finishing & Inspection
All gears undergo final deburring, oil coating, and 100% dimensional inspection using CMM or gear measuring equipment.
Applications of Custom Spur Gears
Our forged spur gears are widely used in industries requiring stable power transmission and long service life, including:
- Industrial Gearboxes – speed reducers, transmission systems, and mechanical drives
- Mining Equipment – crushers, conveyors, and heavy-duty machinery
- Construction Machinery – excavators, loaders, and lifting equipment
- Agricultural Machinery – tractors, harvesters, and drive systems
- Material Handling Equipment – automated production lines and industrial systems
What Information Is Needed for a Custom Spur Gear RFQ?
To evaluate a custom spur gear project, provide the available 2D drawing or 3D model together with:
- Module or diametral pitch
- Number of teeth and pressure angle
- Bore, keyway, spline, and hub dimensions
- Material and heat-treatment requirements
- Required hardness and gear accuracy
- Inspection or documentation requirements
- Estimated order quantity and annual demand
If some specifications are not yet finalized, our engineering team can review the available drawing and application requirements before quotation.
Conclusion
Weforging manufactures custom spur gears that deliver reliable performance under demanding operating conditions. By combining forged steel blanks, precision CNC machining, controlled heat treatment, and comprehensive inspection, we provide gear solutions aligned with OEM requirements for strength, accuracy, and service life.
Contact our engineering team for project evaluation, quotations, or tailored gear specifications.
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